CA2057025A1 - Hydraulic tappet - Google Patents
Hydraulic tappetInfo
- Publication number
- CA2057025A1 CA2057025A1 CA002057025A CA2057025A CA2057025A1 CA 2057025 A1 CA2057025 A1 CA 2057025A1 CA 002057025 A CA002057025 A CA 002057025A CA 2057025 A CA2057025 A CA 2057025A CA 2057025 A1 CA2057025 A1 CA 2057025A1
- Authority
- CA
- Canada
- Prior art keywords
- insert
- outer part
- tappet
- port means
- reservoir
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/20—Adjusting or compensating clearance
- F01L1/22—Adjusting or compensating clearance automatically, e.g. mechanically
- F01L1/24—Adjusting or compensating clearance automatically, e.g. mechanically by fluid means, e.g. hydraulically
- F01L1/245—Hydraulic tappets
- F01L1/25—Hydraulic tappets between cam and valve stem
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/21—Elements
- Y10T74/2101—Cams
- Y10T74/2107—Follower
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
A hydraulic tappet is provided with an outer reservoir extending for 360· on two levels (20, 21), thus causing air bubbles in the oil supplied thereto to remain on the upper level (20) of the outer reservoir. According to a first embodiment of the invention, the circulation of the oil on two levels is provided by means of a first insert (12) made of plastic, the support for the lash adjusting components is provided and by a second insert (14) made of metal sheet, the second insert including a web portion (28) which also serves as a boundary for the lower level reservoir (21).
According to another embodiment of the invention, the support for the lash adjusting components is provided by a hub structure (44) extending axially from the tappet body, and a single plastic insert (50) is provided to define, along with the exterior of the hub portion (44), the two-level reservoir (54 and 60).
According to another embodiment of the invention, the support for the lash adjusting components is provided by a hub structure (44) extending axially from the tappet body, and a single plastic insert (50) is provided to define, along with the exterior of the hub portion (44), the two-level reservoir (54 and 60).
Description
w~so/ls226 PCT/US90/02706 ~ 2 ~ r~ 7 ~t~r) The present invention relates to hydraulic tappets for internal combustion engines, and more specifically to hydraulic tappets of the direct acting ~ucket type.
05 In the design of bucket tappets having an outer reservoir and an inner reservoir as e~emplified by the tappets shown in U.S. Patent No. 4,590,~98 to Buente et al., it is important to prevent air bubbles present in the oil coming from the lubrlcation circuit from reaching th~ inner reservoir and 1nally the high :~ pressure chamb~r, since this has a negative effect on the supply o~ oil to the inner reservoir and to the high ;. pressure chamber and therefore on the adjustment of the play of the tappet when an internal combustion engine is restarted. Thore are alread~ known hydraulic tappe~
substantially compri~1ng a ~irst outer part or body which ~ngages tho drlving aam and hu~ an out~r annular re~ervo~r wh~re thQ o~l aollect~, and a ~oco~d ~nn~
part wh~ch ~lides tele~copl~ally ln~id~ th~ ~ir~t ono and is connected to the stem o~ a valve of the internal combustion engine, the inner reservoir and the high pres~ure chamber.of variable capacit~ being provided by telescopic coupling of the first part inside the second one, said high pressure chamber communicating with the inner reservoir via a one way ball-valve.
As shown in U.S. Patent No. 4,782,799 to Goppelt et . al., it is known to provide within such a tappet a , member which forces the oil to travel upward to the outer reservoir through a duct from an inlet port . 30 located in a low position relative to the outer ,!; ' reservoir, flow along a circular path through 180 to ~ a second duct which ~arries the oil from a low level of .. ~
.~ .
, , .
~.'. . ! ', . ; ,. ., ': . ', ,, , . . . ' ' , ' . , . . , - , , W090/15226 ~r~ 2 - PCT/US90/0270 the outer reservoir to the inner reservoir, thus providing a circuitous oil path which aids in deaerating the oil.
The present invention is an improvement to the above 05 design wherein the tappet includes structure which causes the oil to traverse a 360 circular path and through two vertical levels in 1Owing from the inlet to the inner reservoir.
~nitially, the oil 1Ows along the upper level ~or 180 and then descends to a lower level, where it flows ~or another 180. Hence it goes up a vertical channel to reach the inner reservoir. As air is lighter than oil,'the air tends to stay in the upper part o the outer reservoir hence the oil in the lower area o~ the }5 outer reservoir contain~ practically no air.
~ ccordin~ to a ~lr~t embodimen~ o the invent~orl, ther0 are provld~d two ln~r~3 ~ormln~ a two-l~v~l outer reaervoir and a guide ~or th~ t~ coplc parts oÇ the tappot. Communication between the upper and lower levels o~ the inner annular reservoir is achieved via an opening provided between the two levels. The bottom of the lower level of the outer annular reservoir is ~ormed by one of said inserts comprising a hub member including a web portion e~tending radially inwardly from the outer part or body of the tappet and an axially extending hub portion acting as a guide for the telescopically moving parts of the tappet.
According to another embodiment of the present invention, there is provided a single insert which forms the two-level outer reservoirl the hub member serving as a guide for the telescopic parts being provided by an axially-e~tending cylindrical e~tension o the end wall o the outer part.
W090/15226 2~C~7~/Us90/o27o6 The present invention will now be described in detail, with reference to the attached drawings, wherein:
Fig. 1 shows a vertical cross-section of the outer part of the tappet, according to a first form of 05 embodiment; and Fig. 2 shows a vertical cross-section of a second embodiment o the inventlon.
~ ccording to the irst embodiment o the ~nvention (see Flg. 1), the outer part 10 o the hydraulic tappet comprises a moulded or drawn cup-shaped member shaped as an upside-down bowl wherein there is inserted a first insert 12 preferably made of a plastic material and a second insert deining a hub membe~ 14, pre~arably made o~ metal, whlch comprlses an upper cyllndrical hub portion 26 and a lower unnel-~haped web portion 28.
The ~iret in~ert 1~, annular 1n ~hape and wikh a cros~-~ec~ion ~ub~tant~all~ in tha ~h~p~ o~ an '~II", re~ts on the s~con~ insert, whlch is rec~lved in a circular seat 17 providëd on the inner surace o a ~ertlcal wall 16 of the outer part 10 b~ means o~ a collar 15. The placement o~ insert 12 into the ~avity of the outer part 10, provides an annular reservoir lB.
The oil coming from the lubrication circuit o~ the ; internal combustion engine fills the annular reservoir 18, formed by the insert 12 and the outer vertical wall 16, and then overflows, via a groove 19, into an outer upper reservoir 20, flowing along a circular path for 180 until it reaches an area 20a of the upper level or upper chamber of the outer reservoir. The oil then moves to a lower level or ~o a lower chamber 21 via an opening 22, flows along a circular path ~or another ` lB0 and finally reaches an area ~la. The air bubbles which m~ht have been pre~ent ~n the oil tend to sta~ ~n . ~
:
~ 4 -the upper part of the outer reservoir, namely in an upper area of the upper level 20-20a of the outer reservoir, given the lightness of air compared with oil. Subsequently, the oil passes through a channel 05 defined by a vertical recess 24 formed in the annular insert 12 and fills the inner reservoir 30. The inner reservoir 30 is deined by the inside diameter of a piston 31b. The inner part 31 comprises a plunger 31a engageable with the valva stem, the pis~on 31b slidingly received within the plunger, and a check val~e 31c. The web 28 o the second insert 14 ~orms the bottom of the lower level or lower chamber 21-21a of the outer reservoir. Since provision has been made for a two-level outer reservoir, the oil 1Owing ~rom the ; 15 upper to the lower level o~ the ou~er re~ervoir practically con~ain~ no air bubbles, becau~e alr 1 lighter than oil an~ ther~ore tend~ to atay in th~
; upper area o the upper level 20-20a Oe th~ out~r re~er~oir.
A urth~r advantage of this embodiment is the fact that the second insert 14 has a double function, acting both as a bottom or the lower level of the outer reservoir and as a guide or the telescopically moving parts.
According to the second embodiment of the invention, shown in Fig. 2, the outer part 10 of the hydraulic tappet comprises a cup-shaped part provided with an ~-inner annular collar or hub member 44 which narrows at its free end 46. In the space provided between the outer wall 4B of the part 10 and the inner annular collar 44, 46 there is placed an insert 50 preferably made of plastic material. This insert 50 is shaped in such a way as to form, together with the arrangement of WO90/l5226 PCT/US90/02706 ,~i,.~l .. - 5 ~ ,~7n~
part 10, an overflow duct defined by a vertical channel 52 in the insert 50, an upper level or upper chamber 54-54a in the outer reservoir and a lower level or lower chamber 60-60a in the outer reservoir. The oil coming 05 from the lubrication circuit of the internal combustion engine as shown by the arrow, enters the overflow duct 52 via an opening 59, and, having filled it, flows through an opening 56 provided in the upper part o~ the insert 50 lnto the outer re ervoir, at a place .`
corresponding to the upper level or upper chamber 5~ of the outer reservoir. Subsequently, the oil flows along an annular path extending for 180 to reach an area 54a o the upper level or upper chamber 54 of the outer reservoir. From there, via a duct 62, it 10w8 to ~he lowe~ }evel or lower chamber 60 o the outer re8ervoir, and having flowed anather 1~0 along a clr~ular ~a~h, ~;; reache8 an ar~a 60a o the low~r lev~l or low~r ch~mb~
60 o~ the outcr re~ervoir, ~l~nce, ~a an openlng ~ an~
a duct 66 deined b~ the annuliar space between inner part 31 and collar 44, ~t 1OWS into the inner reservoir 30. In the second embodiment, the inner part 31 is guided by the inner cylindrical sur~a~e form~d by wall 46.
An annular extension or rim 70 of the inser~ 50 is : 25 an interference fit in a seat 71 suitably provided on the inner surface of the wall 4B of part 42 and an ` extension or rim 72 is an interference fit in seat 73 formed in the wall 46.
This second embodiment of the invention offers the same advantages as the first embodiment, by using a ; single more complex insert which is itted into the ``'~ outer part 10.
' ~' '
05 In the design of bucket tappets having an outer reservoir and an inner reservoir as e~emplified by the tappets shown in U.S. Patent No. 4,590,~98 to Buente et al., it is important to prevent air bubbles present in the oil coming from the lubrlcation circuit from reaching th~ inner reservoir and 1nally the high :~ pressure chamb~r, since this has a negative effect on the supply o~ oil to the inner reservoir and to the high ;. pressure chamber and therefore on the adjustment of the play of the tappet when an internal combustion engine is restarted. Thore are alread~ known hydraulic tappe~
substantially compri~1ng a ~irst outer part or body which ~ngages tho drlving aam and hu~ an out~r annular re~ervo~r wh~re thQ o~l aollect~, and a ~oco~d ~nn~
part wh~ch ~lides tele~copl~ally ln~id~ th~ ~ir~t ono and is connected to the stem o~ a valve of the internal combustion engine, the inner reservoir and the high pres~ure chamber.of variable capacit~ being provided by telescopic coupling of the first part inside the second one, said high pressure chamber communicating with the inner reservoir via a one way ball-valve.
As shown in U.S. Patent No. 4,782,799 to Goppelt et . al., it is known to provide within such a tappet a , member which forces the oil to travel upward to the outer reservoir through a duct from an inlet port . 30 located in a low position relative to the outer ,!; ' reservoir, flow along a circular path through 180 to ~ a second duct which ~arries the oil from a low level of .. ~
.~ .
, , .
~.'. . ! ', . ; ,. ., ': . ', ,, , . . . ' ' , ' . , . . , - , , W090/15226 ~r~ 2 - PCT/US90/0270 the outer reservoir to the inner reservoir, thus providing a circuitous oil path which aids in deaerating the oil.
The present invention is an improvement to the above 05 design wherein the tappet includes structure which causes the oil to traverse a 360 circular path and through two vertical levels in 1Owing from the inlet to the inner reservoir.
~nitially, the oil 1Ows along the upper level ~or 180 and then descends to a lower level, where it flows ~or another 180. Hence it goes up a vertical channel to reach the inner reservoir. As air is lighter than oil,'the air tends to stay in the upper part o the outer reservoir hence the oil in the lower area o~ the }5 outer reservoir contain~ practically no air.
~ ccordin~ to a ~lr~t embodimen~ o the invent~orl, ther0 are provld~d two ln~r~3 ~ormln~ a two-l~v~l outer reaervoir and a guide ~or th~ t~ coplc parts oÇ the tappot. Communication between the upper and lower levels o~ the inner annular reservoir is achieved via an opening provided between the two levels. The bottom of the lower level of the outer annular reservoir is ~ormed by one of said inserts comprising a hub member including a web portion e~tending radially inwardly from the outer part or body of the tappet and an axially extending hub portion acting as a guide for the telescopically moving parts of the tappet.
According to another embodiment of the present invention, there is provided a single insert which forms the two-level outer reservoirl the hub member serving as a guide for the telescopic parts being provided by an axially-e~tending cylindrical e~tension o the end wall o the outer part.
W090/15226 2~C~7~/Us90/o27o6 The present invention will now be described in detail, with reference to the attached drawings, wherein:
Fig. 1 shows a vertical cross-section of the outer part of the tappet, according to a first form of 05 embodiment; and Fig. 2 shows a vertical cross-section of a second embodiment o the inventlon.
~ ccording to the irst embodiment o the ~nvention (see Flg. 1), the outer part 10 o the hydraulic tappet comprises a moulded or drawn cup-shaped member shaped as an upside-down bowl wherein there is inserted a first insert 12 preferably made of a plastic material and a second insert deining a hub membe~ 14, pre~arably made o~ metal, whlch comprlses an upper cyllndrical hub portion 26 and a lower unnel-~haped web portion 28.
The ~iret in~ert 1~, annular 1n ~hape and wikh a cros~-~ec~ion ~ub~tant~all~ in tha ~h~p~ o~ an '~II", re~ts on the s~con~ insert, whlch is rec~lved in a circular seat 17 providëd on the inner surace o a ~ertlcal wall 16 of the outer part 10 b~ means o~ a collar 15. The placement o~ insert 12 into the ~avity of the outer part 10, provides an annular reservoir lB.
The oil coming from the lubrication circuit o~ the ; internal combustion engine fills the annular reservoir 18, formed by the insert 12 and the outer vertical wall 16, and then overflows, via a groove 19, into an outer upper reservoir 20, flowing along a circular path for 180 until it reaches an area 20a of the upper level or upper chamber of the outer reservoir. The oil then moves to a lower level or ~o a lower chamber 21 via an opening 22, flows along a circular path ~or another ` lB0 and finally reaches an area ~la. The air bubbles which m~ht have been pre~ent ~n the oil tend to sta~ ~n . ~
:
~ 4 -the upper part of the outer reservoir, namely in an upper area of the upper level 20-20a of the outer reservoir, given the lightness of air compared with oil. Subsequently, the oil passes through a channel 05 defined by a vertical recess 24 formed in the annular insert 12 and fills the inner reservoir 30. The inner reservoir 30 is deined by the inside diameter of a piston 31b. The inner part 31 comprises a plunger 31a engageable with the valva stem, the pis~on 31b slidingly received within the plunger, and a check val~e 31c. The web 28 o the second insert 14 ~orms the bottom of the lower level or lower chamber 21-21a of the outer reservoir. Since provision has been made for a two-level outer reservoir, the oil 1Owing ~rom the ; 15 upper to the lower level o~ the ou~er re~ervoir practically con~ain~ no air bubbles, becau~e alr 1 lighter than oil an~ ther~ore tend~ to atay in th~
; upper area o the upper level 20-20a Oe th~ out~r re~er~oir.
A urth~r advantage of this embodiment is the fact that the second insert 14 has a double function, acting both as a bottom or the lower level of the outer reservoir and as a guide or the telescopically moving parts.
According to the second embodiment of the invention, shown in Fig. 2, the outer part 10 of the hydraulic tappet comprises a cup-shaped part provided with an ~-inner annular collar or hub member 44 which narrows at its free end 46. In the space provided between the outer wall 4B of the part 10 and the inner annular collar 44, 46 there is placed an insert 50 preferably made of plastic material. This insert 50 is shaped in such a way as to form, together with the arrangement of WO90/l5226 PCT/US90/02706 ,~i,.~l .. - 5 ~ ,~7n~
part 10, an overflow duct defined by a vertical channel 52 in the insert 50, an upper level or upper chamber 54-54a in the outer reservoir and a lower level or lower chamber 60-60a in the outer reservoir. The oil coming 05 from the lubrication circuit of the internal combustion engine as shown by the arrow, enters the overflow duct 52 via an opening 59, and, having filled it, flows through an opening 56 provided in the upper part o~ the insert 50 lnto the outer re ervoir, at a place .`
corresponding to the upper level or upper chamber 5~ of the outer reservoir. Subsequently, the oil flows along an annular path extending for 180 to reach an area 54a o the upper level or upper chamber 54 of the outer reservoir. From there, via a duct 62, it 10w8 to ~he lowe~ }evel or lower chamber 60 o the outer re8ervoir, and having flowed anather 1~0 along a clr~ular ~a~h, ~;; reache8 an ar~a 60a o the low~r lev~l or low~r ch~mb~
60 o~ the outcr re~ervoir, ~l~nce, ~a an openlng ~ an~
a duct 66 deined b~ the annuliar space between inner part 31 and collar 44, ~t 1OWS into the inner reservoir 30. In the second embodiment, the inner part 31 is guided by the inner cylindrical sur~a~e form~d by wall 46.
An annular extension or rim 70 of the inser~ 50 is : 25 an interference fit in a seat 71 suitably provided on the inner surface of the wall 4B of part 42 and an ` extension or rim 72 is an interference fit in seat 73 formed in the wall 46.
This second embodiment of the invention offers the same advantages as the first embodiment, by using a ; single more complex insert which is itted into the ``'~ outer part 10.
' ~' '
Claims (5)
1. In a hydraulic tappet comprising a substantially cup-shaped outer part having an engine cam contacting surface formed thereon; a hub member received within and supported by said outer part; an inner part slidingly received within said hub member and having an engine valve contacting surface formed thereon, said outer part and said hub member defining an annular space between them; and an oil inlet formed in said outer part and opening into said annular space; the improvement comprising an annular insert received within said annular space, said insert in combination with said hub member, said inner part and said outer part defining an upper annular chamber, a lower annular chamber and an inner reservoir; first port means defining an oil flow path path between said oil inlet and said upper annular chamber; second port means defining an oil flow path from said upper annular chamber to said lower annular chamber; and third port means defining an oil flow path from said lower annular chamber to said inner reservoir;
said first and third port means being in substantial angular alignment with each other, and said second port means being displaced substantially 180° from said first and third port means.
said first and third port means being in substantial angular alignment with each other, and said second port means being displaced substantially 180° from said first and third port means.
2. A tappet as claimed in claim 1 in which said insert comprises a member substantially H-shaped in cross section, and said hub member comprises a web portion extending radially inwardly from the inner wall of said outer part and an axially extending tubular portion receiving said inner part, said web portion defining a lower boundary of said lower annular chamber.
3. A tappet as claimed in claim Z, in which an inner wall of said insert is in sealing engagement with said hub portion and said third port means comprises a channel formed in said inner wall defining a passage between said inner wall and said hub portion.
4. A tappet as claimed in claim 1, in which said hub member comprises a cylinder extending axially from the base portion of said outer part, and said insert comprises an annular member received between said hub and the interior wall of said outer part.
5. A tappet as claimed in claim 4 in which said insert includes an inwardly extending rim engaged with a recess formed in said hub member, and an outwardly extending rim engaged with a recess formed in said interior wall.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT20601A/89 | 1989-05-23 | ||
| IT8920601A IT1229355B (en) | 1989-05-23 | 1989-05-23 | HYDRAULIC TAPPETS WITH OIL CIRCULATION ALONG A 360 DEVELOPING PATH [ON TWO LEVELS. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2057025A1 true CA2057025A1 (en) | 1990-11-24 |
Family
ID=11169396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002057025A Abandoned CA2057025A1 (en) | 1989-05-23 | 1990-05-15 | Hydraulic tappet |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5129374A (en) |
| EP (1) | EP0474794B1 (en) |
| CA (1) | CA2057025A1 (en) |
| DE (1) | DE69005633T2 (en) |
| IT (1) | IT1229355B (en) |
| WO (1) | WO1990015226A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4209442A1 (en) * | 1992-03-24 | 1993-09-30 | Schaeffler Waelzlager Kg | Tappet with hydraulic valve clearance compensation |
| WO1993022542A1 (en) * | 1992-04-27 | 1993-11-11 | Nittan Valve Co., Ltd. | Direct acting hydraulic lash adjuster |
| US5255639A (en) * | 1992-10-15 | 1993-10-26 | Siemens Automotive L.P. | Integral EVT/cylinder head assembly with self-purging fluid flow |
| US5216988A (en) * | 1992-10-15 | 1993-06-08 | Siemens Automotive L.P. | Dual bucket hydraulic actuator |
| IT1279048B1 (en) * | 1995-10-27 | 1997-12-04 | Eaton Automotive Spa | HYDRAULIC TAPS WITH WELD-FREE SIPHON EFFECT, WITH DOUBLE EXTERNAL RING TANK |
| DE19724563A1 (en) * | 1997-06-11 | 1998-12-17 | Schaeffler Waelzlager Ohg | Cup-shaped valve tappet for gas exchange valve |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5965508A (en) * | 1982-10-08 | 1984-04-13 | Aisin Seiki Co Ltd | Hydraulic lifter for ohc direct type device |
| US4567862A (en) * | 1982-11-09 | 1986-02-04 | Aisin Seiki Kabushiki Kaisha | Hydraulic lifter device |
| DE3412175A1 (en) * | 1984-03-31 | 1985-10-10 | Motomak Motorenbau, Maschinen- u. Werkzeugfabrik, Konstruktionen GmbH, 8070 Ingolstadt | CUP-SHAPED HOUSING OF A SELF-ACTUATING HYDRAULICALLY ADJUSTING VALVE TOLDER FOR INTERNAL COMBUSTION ENGINES WITH OVERHEAD CAMSHAFT |
| DE3432438C1 (en) * | 1984-09-04 | 1986-05-22 | Daimler-Benz Ag, 7000 Stuttgart | Bucket tappet with hydraulic clearance adjustment for an exhaust and refill valve of an internal combustion engine |
| DE3528432A1 (en) * | 1985-08-08 | 1987-02-19 | Motomak | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
| DE3542192A1 (en) * | 1985-11-29 | 1987-06-04 | Schaeffler Waelzlager Kg | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
| DE3628619A1 (en) * | 1986-08-22 | 1988-03-03 | Schaeffler Waelzlager Kg | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
| DE8808711U1 (en) * | 1988-03-26 | 1988-08-25 | INA Wälzlager Schaeffler KG, 8522 Herzogenaurach | Self-adjusting hydraulic valve tappet |
| DE3812333A1 (en) * | 1988-04-14 | 1989-10-26 | Schaeffler Waelzlager Kg | AUTOMATICALLY HYDRAULICALLY ADJUSTING VALVE |
-
1989
- 1989-05-23 IT IT8920601A patent/IT1229355B/en active
-
1990
- 1990-05-15 US US07/773,552 patent/US5129374A/en not_active Expired - Lifetime
- 1990-05-15 CA CA002057025A patent/CA2057025A1/en not_active Abandoned
- 1990-05-15 DE DE90914015T patent/DE69005633T2/en not_active Expired - Fee Related
- 1990-05-15 WO PCT/US1990/002706 patent/WO1990015226A1/en active IP Right Grant
- 1990-05-15 EP EP90914015A patent/EP0474794B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0474794A4 (en) | 1992-04-08 |
| EP0474794A1 (en) | 1992-03-18 |
| IT8920601A0 (en) | 1989-05-23 |
| DE69005633T2 (en) | 1994-04-28 |
| EP0474794B1 (en) | 1993-12-29 |
| WO1990015226A1 (en) | 1990-12-13 |
| DE69005633D1 (en) | 1994-02-10 |
| IT1229355B (en) | 1991-08-08 |
| US5129374A (en) | 1992-07-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |